Scope 4 emissions: what avoided emissions mean for business

When measuring a company's carbon footprint, most businesses focus on Scope 1, Scope 2 and Scope 3 emissions as defined by the Greenhouse Gas Protocol. A further concept, often informally called Scope 4, has gained attention: it refers to avoided emissions, the emissions prevented by a company's products, services or operational strategies compared with a more carbon-intensive alternative.

It is important to be clear from the outset: Scope 4 is not an official category in the GHG Protocol or ISO standards. This article explains what avoided emissions are, why interest in them is growing, and how businesses can quantify and communicate them credibly without crossing into greenwashing.

Understanding avoided emissions

Avoided emissions (also called "Scope 4" or comparative emissions) are the greenhouse gases that would have been emitted if a more carbon-intensive product or service had been used instead. For example, if an electric car replaces a petrol vehicle, the difference in lifetime emissions can be described as avoided emissions.

The most authoritative reference is the WBCSD Guidance on Avoided Emissions, first published in 2023 with Carbone4's Net Zero Initiative and refined in a version 2.0 in 2025. A central principle of that guidance is that avoided emissions must be reported separately from a company's Scope 1, 2 and 3 inventory; they should never be subtracted from it, used as offsets, or presented as part of a net-zero claim.

Examples of avoided emissions in action

1. Renewable energy products: a solar panel manufacturer can estimate avoided emissions where its product displaces coal- or gas-fired electricity.
2. Efficient appliances: a maker of energy-saving refrigerators or air conditioners can calculate how much energy, and therefore CO2, customers avoid by choosing their product over less efficient models.
3. Shared mobility: ride-sharing platforms or micro-mobility solutions such as e-scooters can reduce individual car trips.
4. Digital transformation: moving from physical mail to email, or from in-person to virtual meetings, can prevent a notable volume of emissions.

Why avoided emissions matter

1. Innovation incentive: tracking avoided emissions gives companies a strong business case to invest in sustainable product design and R&D.
2. Marketing and branding: when handled honestly, avoided emissions can differentiate products and resonate with eco-conscious customers.
3. Investor interest: as ESG investing matures, demonstrating a decarbonising impact can attract capital from green finance funds.
4. Policy alignment: future policy may reward companies that not only cut their own emissions but also help customers and value chains reduce theirs.

Measuring avoided emissions

Quantifying avoided emissions relies on counterfactual scenarios, estimating the emissions that would have occurred without the product or service. Typical approaches include:

• Life cycle assessment (LCA): compare emissions over the full life cycle of the reference product (for example fossil-fuel-based) with the alternative (renewable or electric).
• Industry benchmarks: use average emissions data for comparable products as a baseline.
• Behavioural metrics: for mobility solutions, track how many vehicle miles were displaced by shared rides or e-scooter use.

Challenges and controversies

1. Methodological complexity: building accurate counterfactual baselines is hard, and the assumptions made (usage rates, grid emission factors) can significantly alter results.
2. Risk of greenwashing: without disciplined guidelines, companies might overstate avoided emissions and undermine credibility.
3. Double counting: several organisations may claim the same avoided emissions (the solar panel supplier, the installer and the utility), complicating any true net-impact figure.
4. Not an inventory scope: because no regulatory framework mandates or standardises "Scope 4" reporting, it must complement, never replace, a proper Scope 1-3 inventory.

Best practices for reporting avoided emissions

• Transparency: disclose all methodologies, baselines and assumptions in detail.
• Separate reporting: keep avoided emissions clearly apart from your Scope 1, 2 and 3 inventory, in line with WBCSD guidance.
• Third-party verification: have avoided-emissions calculations audited by reputable, independent reviewers.
• Conservative estimates: it is better to underestimate than to risk credibility with over-optimistic claims.
• Align with recognised methods: base calculations on established LCA standards such as ISO 14044 or PAS 2050.

Example: a clean-tech manufacturer

Consider a wind turbine company that sells turbines to replace coal-based power. By estimating the electricity a turbine generates over its lifespan, comparing it with the emissions from coal power, and accounting for manufacturing and transport emissions, the company can present a net avoided-emissions figure. Presented separately from its own inventory, this helps the manufacturer demonstrate the value of its solutions to utilities and governments.

The future of Scope 4

While not formalised, the concept could evolve as stakeholder interest grows. The GHG Protocol itself opened a consultation in 2024 on Beyond Value Chain Mitigation, and bodies such as the Science Based Targets initiative are examining how to recognise wider decarbonising impact. The direction of travel is towards more rigorous, standardised ways to highlight a company's positive "handprint" alongside its footprint.

Integrating avoided emissions into your strategy

1. Identify core products and services: which offerings genuinely replace high-carbon alternatives?
2. Develop metrics and tools: use LCA software or partner with academic institutions for rigorous methodological support.
3. Collaborate across the value chain: suppliers and customers can provide data to build more accurate baselines.
4. Communicate carefully: educate employees about avoided emissions and share only validated, clearly separated figures in your sustainability reports.

Avoided emissions: a complement, not a substitute

"Scope 4" remains an emerging and sometimes debated concept, but it usefully highlights the positive climate impact a company can have through its products and innovations. As businesses race to decarbonise, showcasing avoided emissions can be a genuine differentiator, provided the claims are transparent, independently verified, reported separately from the inventory, and free of exaggeration.